Paper pulp beating engine



(No Model.) 7 Sheets-Sheet 1.

A. E. REED.

PAPER PULP HEATING ENGINE.

No. 503,553. ented Aug. 15,1893

(No Model.) 7 Sheets-Sheet 2. A. E. REED.

PAPER PULP BEATING; ENGINE. No. 503,553. Patented Aug. 15, 1893;

(No Model.) 7 Sheets-Sheet 3. A. E. REED. PAPER PULP BEATING ENGINE.

No. 503,553. Patented Aug. 15,1893.

(No Model.) 7 Sheets-Sheet 4. A.E. REED. PAPER PULP BEATING ENGINE.

No. 503,553. Patented Aug. 15, 1893.

Fig. 5.

7 Sheets-Sheet 5.

no Model.)

M A E REED PAPER PULP BEATING ENGINE.

No. 503,553. Patented Aug. 15, 1893.

(No Model.) 7 sham-sheet c.

A. E. REED. PAPER PULP HEATING ENGINE No. 503,553. Patented Aug. 15,1893.'

(No Model.) 7 Sheets-Sheet 7.

A. E. REED. PAPER PULP HEATING ENGINE.

Patented Aug. 15, 1893.

UNITED STATES PATENT OFFICE.

ALBERT E. REED, OF GRAVESEND, ENGLAND.

PAPER-PULP-BEATING ENGINE.

SPECIFICATION forming part of Letters Patent No. 503,553, dated August15, 1893. Application filed October 16, 1891. Serial No. 408,928. (Nomodel.) Patented in England November 25, 1890,1l0. 19,107-

To ctZZ whom it may concern:

Be it known that I, ALBERT EDWIN REED, paper-maker, a subject of theQueen of Great Britain and Ireland, residing at Devonshire Hou se,PelhamRoad, Gravesend,in the county of Kent, England, have invented certainImprovements in Paper-Pulp-Beating Engines,

of which the following is a specification.

The said invention has been patented to me in Great Britain byLetters-Patent No. 19,107, dated November 25, 1890.

The object of my invention is to provide a paper pulp beating enginewhich while requiring less power to operate it will more effectually mixand operate upon the materials treated than is the case with beatingengines as hitherto constructed.

According to my invention I combine with the engine in the line oftravel of the materials treated and directly connected to the trough ofthe engine a centrifugal pump or forcing device by which the materialsafter being operated upon by the beater roll'or rolls and passingthrough the trough or channel are pumped or returned to the roll orrolls and so on continuously until the pulp is sufficiently prepared.The roll (or each roll) is arranged as hereinafter described so that itdoes not rotate in any considerable depth of pulp and has not thereforeto perform the function of a lifter and propeller and consequently mayhave its ribs or bars-but slightly projecting and closer together than.usual so that between them there are not the considerable spaces whichin ordinary engines prevent much of the materials being properly actedupon.

There may be combined with the engine a passage for the delivery of theprepared pulp to the stuff chests of the paper making machines so thatwhen the charge has been properly treated the passage by which the pumpdelivers back to the roll or rolls of the beaters can be closed and thepassage to the said stuif chests be opened so that the prepared pulp ispumped therethrough.

In order that my invention may be fully understood I shall now proceedmore particularly to describe the same and for that purpose shall referto the several figures on the annexed drawings the same letters ofreference indicating corresponding parts in all the views.

Figure 1 is a side elevation and Fig. 2 a plan of a pulp beatingapparatus constructed according to my invention in which a centrifugalpump is employed for circulating the pulp. Figs. and 4: are transversesections of the trough respectively taken on the lines 1, 2 and 3, 4: ofFig. 2. Figs. 5, 6 and 7 are respectively a side elevation, a plan, anda transverse section (on the line 5, 6 of Fig. 6) of a modifiedarrangement wherein a screw propeller is employed instead of a pump forcirculating the pulp. Fig.8 is a central vertical section on an enlargedscale of the beater-roll and parts adjacent thereto.

Referring to Figs. 1 and 2 A A is atank or trough through which the pulpis caused to circulate andain which it is operated on by the beater rollB. The bottom of the part A of the trough or tank inclines downward fromthe front end where the roll 13 is situated to the opposite end a andthe part at A also inclines downward from the end a to the end 1). Thepart A of the trough gradually reduces in width from a to b and at theend b terminates in a neck 0 which is connected to the suction end 0 ofa centrifugal pump D. The bottom of the trough A A may be flat ifdesired but I prefer to make it, except just beneath the roll B, concaveand preferably semicircular so as to have no angles for the pulp tocollect in. This is shown clearly in Figs. 3 and 4.

The delivery pipe d of the pump is connected to the part A of the troughor tank in front of the roll B and delivers the material into the tankthrough a flared or widened passage so as to spread the pulp so that itis efficiently distributed to the roll B by running down thereto overthe inclined surface o The pulp after passing under the roll at onceruns down the inclined bottom of the trough Without accumulating orrising to any considerable depth or having to be lifted by the roll overany saddle or rising surface before it reaches the bottom of the trough.A branch c from the pipe 61 leads to the stuff chest or receptacle andathree way cock f is provided at the junction of the branch e and theinlet passage to the trough A so that by means of this cock the pulppumped from the part A of the trough may be directed into the part A tobe further acted upon by the roll 13 or when the pulp is sufficientlybeaten the cock may be turned so as to direct the pulp into the stuffchests by the branch pipe 6. This arrangement allows of the beatingengine being placed on the same level as, or lower than, the stuffchests. As the roll B has not to act as either a propeller or a lifterof the pulp the knives thereon may be arranged at a much finer pitchthan is the case with ordinary heaters and so the rollcan be driven withless motive power than usual. The roll is mounted as usual in bearingsgfitted to slide in guides h bolted to the trough or tank A and providedwith screwedrods t'and gearing for adjusting the roll. The roll B may bedriven from any suitable prime mover by a strap passing round the pulleyp on the end of the shaft or axis of the roll and preferably situatedbetween the parts A and A of the trough. The pump D can be driven fromthe same end of the axis of the roll by a strap passing round thepulleys q r which are suitably proportioned to impart to the pump thedesired speed relatively to the speed of the roll B. By driving the pumpdirect from the axis of the roll 13, if the driving strap slips offthepulley p or the motion of, the roll be otherwise stopped the pumpwill also be stopped and thereby prevent the accumulation of the pulp infront of the roll. I

The size of the pump and the speed of rotation should be regulatedaccording to the quantity of pulp being operated on and it has beenfound in practice thatfor a beater capable of operating on fivehundredweight of pulp what is known as a six inch centrifugal pump (inwhich the diameter across the vanes or blades is usually abouttwenty-four inches) is suitable.

D is a washer drum which may be of the usual construction mounted andworked in the usual manner.

a: is the usual emptying valve in the bottom of the trough A for thedischarge of the pulp; but this is of course not necessary when thestuff chests are at the same level as or at a higher level than the pumpand the discharge pipe e is used.

y is the wash out valve.

Instead of the centrifugal pump for circulating the pulp through thetrough A A as hereinbefore described a screw propeller may be employedfor the purpose arranged and operated as illustrated in Figs. 5, 6 and 7of the drawings. In this arrangement the lower and discharge end I) ofthe trough A is connected by a tube or tubular passage d with the troughA just in front of the roll B. In

, this tube or passage d is fitted to rotate the screw propeller Ddriven from the axis of the roll B (by a strap or band passing round thepulleys q r) at such a speed as to cause the material to be fed to theroll as fast as it passes between the said roll and the lower grindingsurface a constant circulation of the,

edfor certain purposes as the equivalent of a centrifugal pump, thelatter is preferred as being more convenient and efficlent, butparticularly because, as arranged 111 Figs. 1 and 2, the pump can beused to convey the stuff from the breaker to the beating engine, as wellas to discharge it into the stuff chests, which is an advantage of greatpractical im* portance.

By means of apparatus constructed as hereinbefore described a completemixing of the pulp may be effected very rapidly and by reason of theteeth on the roll B be1ng of fine pitch the roll B serves as a combinedheater and refiner, while the apparatus 15 s1m ple and inexpensive inconstruction and more compact than ordinary machines of this kindandless motive poweris required to drive 1t.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is- I 1. In a pulp beating engine, the combination of abeater-roll, co-operating bed knives, a trough inclined away from thebeater-roll, a return pipe or channel leading from the lowest level ofthe trough to the front of the roll and discharging at a level slightlyabove the bottom thereof, said pipe or channel being contracted untilits inclination is directed downwardly in front of the roll, and adevice working in said return channel for forcing a circulation of thepulp, substantially as described.

2. The combination with the inclined trough and beater-roll therein, ofa return channel leading from the bottom of the trough to the front ofthe roll, a pump forming part of said return channel, a discharge pipeconnected therewith and a controlling cook or valve, substantially asdescribed.

3. The combination with the trough having an inclined bottom, thebeater-roll and bed-knives located at that end of said trough where thelevel is highest, a pipe or channel leading from the other end of thetrough and discharging tangentially against the bottom of the roll andin the direction of its rotation, said pipe or channel being contracteduntil it discharges against the bottom of the roll, and a forcing deviceworking in said return pipe or channel, substantially as described.

4:. In a pulping engine in which the circulation of the paper-stock iseffected independently of the beater-roll, the combination of a devicefor forcing circulation of the pulp with a channel leading the stockfrom the beater roll downwardly to another also downwardly inclined butgradually contracted channel, so as to convey the paper-stock withoutresistance due to obstructing or disturbing pockets into a pipe orconduit containing said forcing device, said conduit being acontinuation or part of the said channel for discharging the pulp at thebottom of the beater roll, there to be acted upon by the grinders,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

ALBERT E. REED. Witnesses:

WILLIAM F. UPTON, 47 Lincolns Inn Fields, London, W. C.

H. D. HOSKINS, 9 Birchz'n Lame, London, E. O'.

